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E.15 Clarify when a rethrow would slice to std::exception (#1949)

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Avoided a potential misunderstanding that `throw e` would slice *any* `e` to `std::exception`.

The note about rethrowing appears to be written when the example of this item still did `catch (const exception& e)`, which was prior to commit d568d190f6, "Generalized E.15, closes #1848".
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Niels Dekker
2022-08-08 18:09:41 +02:00
committed by GitHub
parent be1722ad0c
commit 1aafa24880
1 changed files with 1 additions and 1 deletions
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CppCoreGuidelines.md
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@@ -16093,7 +16093,7 @@ Catch by value can be appropriate for a small value type such as an `enum` value
##### Note
To rethrow a caught exception use `throw;` not `throw e;`. Using `throw e;` would throw a new copy of `e` (sliced to the static type `std::exception`) instead of rethrowing the original exception of type `std::runtime_error`. (But keep [Don't try to catch every exception in every function](#Re-not-always) and [Minimize the use of explicit `try`/`catch`](#Re-catch) in mind.)
To rethrow a caught exception use `throw;` not `throw e;`. Using `throw e;` would throw a new copy of `e` (sliced to the static type `std::exception`, when the exception is caught by `catch (const std::exception& e)`) instead of rethrowing the original exception of type `std::runtime_error`. (But keep [Don't try to catch every exception in every function](#Re-not-always) and [Minimize the use of explicit `try`/`catch`](#Re-catch) in mind.)
##### Enforcement